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DTSTART;TZID=America/New_York:20250407T110000
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SUMMARY:Photonics Initiative Seminar: Arthur D. Yaghjian
DESCRIPTION:Dr. Arthur D. Yaghjian (Electromagnetics Research) \nRobust Field-Based Antenna Quality Factor\nAbstract – New field-based quality factors Q(ω) are derived for antennas with known fields produced by an input current. These Q(ω) are remarkably robust because they equal the input-impedance bandwidth quality factor QZ(ω) when the input impedance is available. Like QZ(ω)\, the field-based Q(ω) is independent of the choice of origin of the antenna fields and is impervious to extra lengths of transmission lines and surplus reactances. These robust field-based quality factors are used to derive new lower bounds on the quality factors (upper bounds on the bandwidths) of spherical-mode antennas that improve upon the previous Chu/(Collin-Rothschild) lower bounds for spherical modes. \nBio –  Dr. Arthur D. Yaghjian received the B.S.\, M.S.\, and Ph.D. degrees in electrical engineering from Brown University in 1964\, 1966\, and 1969\, and an Honorary Doctorate from the Technical University of Denmark in 2020. After teaching for a year\, he joined the research staff of the National Institute of Standards and Technology (NIST)\, Boulder\, CO in 1971 and transferred in 1983 to the Air Force Research Laboratories\, Bedford\, MA until 1996 when he became an independent researcher. His early research at NIST helped pioneer the development of probe-corrected near-field antenna measurements for accurately characterizing modern antennas in both the frequency and time domains. More recently\, he has extended the spherical-wave near-field antenna theory to the rigorous analysis of the partially coherent fields radiated by the sun and other stars. His research in electromagnetic theory has led to the fundamental determination of electromagnetic fields in spatially dispersive as well as temporally dispersive natural materials and metamaterials. He has derived the definitive microscopic and macroscopic force and energy expressions for both diamagnetic and paramagnetic media. He has contributed significantly to the determination and fundamental understanding of the classical equations of motion of accelerated charged particles. In the area of high-frequency diffraction\, he and Robert Shore obtained convenient robust expressions for incremental length diffraction coefficients that are currently used to predict bistatic scattering and reflector antenna performance in commercial high-frequency computer codes. His work with Steven Best on the fundamental characterization of antennas\, including the determination of the upper bounds on the bandwidth of complex antennas\, has had a major impact on the research and development of modern electrically small antennas. He holds the patent on supergain electrically small antennas. He is an IEEE Life Fellow and has been an IEEE-APS Distinguished Lecturer. He has received the IEEE Electromagnetics award\, the IEEE-APS Distinguished Achievement award\, four IEEE Schelkunoff prize paper awards\, and has written two well-referenced books\, one co-authored with Thorkild Hansen. \nThis is an in-person seminar.  If you opt to join via zoom use meeting ID 595 955 6744 Passcode 842444
URL:https://asrc.gc.cuny.edu/event/photonics-initiative-seminar-arthur-d-yaghjian/
LOCATION:ASRC Auditorium\, 85 St. Nicholas Terrace\, New York\, NY\, 10031\, United States
CATEGORIES:Photonics
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DTSTART;TZID=America/New_York:20250425T110000
DTEND;TZID=America/New_York:20250425T120000
DTSTAMP:20260521T123236
CREATED:20250312T140122Z
LAST-MODIFIED:20250312T140122Z
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SUMMARY:Photonics Initiative Seminar: Weidong Zhou
DESCRIPTION:Dr. Weidong Zhou\, Photonics Center\, University of Texas at Arlington (UTA) \nScaling towards high-power single-mode PCSELs and PCSEL Arrays\n(Photonic Crystal Surface-Emitting Lasers)  \nAbstract \nWhen it was first invented 60 years ago\, the laser was described as “A solution looking for a problem”. Few predicted that lasers would ultimately support multi-trillion-dollar photonics-enabled markets today. Based on the Fano resonances in photonic crystal cavities and transfer printing heterogeneous integration platform\, we have been working on next-generation semiconductor photonic crystal lasers and related heterogeneously integrated nanophotonic and optoelectronic devices for chip-scale integrated system applications. In this talk\, I will first describe how hybrid and monolithic photonic crystal lasers can address the grand challenges of energy-efficient on-chip lasers\, followed by presentations on scaling challenges in photonic crystal surface-emitting lasers (PCSELs) with high-power\, high brightness\, and high speed. In the second part\, I will discuss heterogeneously integrated photonic crystal optoelectronic devices based on the micro transfer printing process\, including high-speed photonic crystal spatial light modulators and monolayer graphene total absorption in critically coupled photonic crystal cavities and designs toward high speed reconfigurable intelligent surfaces. \nWeidong Zhou is a Distinguished University Professor and Janet and Mike Greene Professor at the University of Texas at Arlington (UTA). He obtained BS and ME degrees from Tsinghua University\, China\, and a Ph.D. degree from University of Michigan\, Ann Arbor. After graduation\, he spent three years at CIENA Corporation working on optical transceiver modules and subsystems for optical communication systems. Prof. Zhou and his group have made significant contributions to semiconductor heterogeneously integrated photonic crystal membrane photonics\, especially photonic crystal lasers\, modulators\, and sensors\, for integrated silicon photonics and flexible optoelectronics. He has published over 400 journal papers and conference presentations\, including many papers published in high-impact journals such as Nature Photonics\, Nature Communications\, Nature Biomedical Engineering\, etc. He has also delivered over 100 invited conference talks. Dr. Zhou is a fellow of SPIE\, a fellow of Optica\, a senior member of IEEE\, and a member of APS and AAAS. He is the Director of UTA Photonics Center. \nThis is an in-person seminar. If you opt to join via zoom use Meeting ID 851 2782 3775\, Passcode 563639
URL:https://asrc.gc.cuny.edu/event/photonics-initiative-seminar-weidong-zhou/
LOCATION:ASRC 5th Floor Data Visualization Room\, 85 St. Nicholas Terrace\, New York\, NY\, 10031\, United States
CATEGORIES:Photonics
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20250429T110000
DTEND;TZID=America/New_York:20250429T120000
DTSTAMP:20260521T123236
CREATED:20250421T152627Z
LAST-MODIFIED:20250430T151339Z
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SUMMARY:Photonics Initiative Seminar: Danial Motlagh
DESCRIPTION:Dr. Danial Motlagh\,  Xanadu \nTitle: A Renaissance in Materials Discovery \nAbstract – Quantum computers have the potential to transform materials discovery for next-generation technologies from a slow and expensive trial and error process into a fast\, cost-effective\, simulation-driven endeavour. In this talk\, I’ll share our vision for a quantum-accelerated materials discovery pipeline and the regimes we believe quantum computers can have the greatest impact in solving real-world problems. I’ll walk through our recent progress toward that goal by introducing our newly developed suite of quantum algorithms for studying functional properties of photoactive materials and our efforts in connecting them to real-world energy applications. \nBio – Danial Motlagh entered the field of quantum computing during his computer science studies at the University of Toronto. Ever since\, he’s been dabbling in all things quantum\, utilizing his expertise in algorithms to develop novel and more efficient quantum algorithms. \nDanial Motlagh started at Xanadu (www.xanadu.ai) two year ago as an intern and now he is the Lead Quantum Algorithm Scientist. \nThis is an in-person seminar. If you opt to join via zoom use Meeting ID 856 1085 4811\, Passcode 739177
URL:https://asrc.gc.cuny.edu/event/photonics-initiative-seminar-danial-motlagh/
LOCATION:ASRC Auditorium\, 85 St. Nicholas Terrace\, New York\, NY\, 10031\, United States
CATEGORIES:Photonics
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